Rust fails to optimize const slice #147163
Description
I tried this code:
const fn test() -> &'static [&'static str] { const ITEMS: &[&str] = const { std::slice::from_ref(&[ "hello", "world", ][0]) }; ITEMS } #[inline(never)] pub fn main() { std::hint::black_box(test()); }I expected to see this happen:
The string world to be pruned from the final binary.
Instead, this happened:
https://godbolt.org/z/WTM5jz987
The array was not pruned at all.
Meta
rustc --version --verbose:
godbolt rustc nightly.